Mestinon Side Effects
Generic name: pyridostigmine
Note: This document contains side effect information about pyridostigmine. Some of the dosage forms listed on this page may not apply to the brand name Mestinon.
Some side effects of Mestinon may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.
For the Consumer
Applies to pyridostigmine: oral conventional 30-mg tablets for military use, oral conventional 60-mg tablets and extended-release tablets, oral oral solution, parenteral injection
Side effects include:
Diarrhea, abdominal pain or cramps, dysmenorrhea, increased flatus, nausea, urinary urgency and frequency.
For Healthcare Professionals
Applies to pyridostigmine: injectable solution, oral syrup, oral tablet, oral tablet extended release
Gastrointestinal side effects have included nausea, vomiting, diarrhea, loose stools, flatulence, abdominal cramps, increased peristalsis, and increased salivation.
Respiratory side effects have included exacerbation of bronchitis and asthma. Adverse effects that are generally associated with overdosage have included increased bronchial secretions and bronchospasm.
Musculoskeletal side effects have included muscle weakness and twitching. Adverse effects that are generally associated with overdosage have included muscle cramps, fasciculation, weakness, and paralysis. Arthralgia, hyperalgesia and joint pain have been reported.
A 46-year-old woman with myasthenia gravis developed arthralgia, hyperalgesia, and joint stiffness after 8 years of pyridostigmine 60 mg orally 5 times daily. The side effects slightly lessened after lowering dose to 60 mg twice a day. Symptoms disappeared upon discontinuation and returned upon rechallenge.
Endocrine side effects have included diaphoresis and rhinorrhea.
Ocular side effects are generally associated with overdosage and have included miosis, lacrimation, and blurred vision.
Dermatologic side effects have included acneiform skin rashes due to the bromide radical, urticaria, toxic alopecia, and alopecia areata.
Hematologic side effects have included thrombophlebitis after intravenous administration. Individual cases of epistaxis and profuse bleeding after a cut have been reported with oral administration.
Cardiovascular side effects have included elevations in blood pressure. Adverse effects that are generally associated with overdosage have included bradycardia, tachycardia, cardiospasm, and hypotension.
Nervous system side effects have included headache, vertigo, and tingling of the extremities. Adverse effects that are generally associated with pyridostigmine (the active ingredient contained in Mestinon) overdosage and/or bromide intoxication have included agitation, coma, confusion, combativeness, delusions, hallucinations, incoordination, irritability, loss of memory, restlessness, and stupor.
Genitourinary effects have included urinary urgency and frequency.
Metabolic side effects have been attributed to bromide intoxication and have included a negative anion gap and hyperchloremia.
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